Cobham MicrowavePriority listing
- Cobham Microwave has a long term experience in Microwave Systems and Components. Their five areas of capabilities are Systems and Components: Diodes & Modules, Ferrite Devices, RFFilters, and Waveguides.

IDSP
- IDSP is an app for IPHONE and IPOD Touch.
Made by 2 powerful filters, a band pass and a band stop with adjustable bandwidth. Filters are butterworth 4 and 8 poles, sample rate at 44,100 32 bit. Cancel every noise and hear only your qso.

5th order High Pass VHF Filter
- Sometimes many VHF-UHF modern transceivers have problems with BROADCAST Interference and CROSS-modulation from FM commercial broadcast stations this article shows a simple Batteworth HI-Pass VHF Filter to reduce this problem

KI5YN QLF Filter
- A microprocessor based interface designed to go between a standard Morse code key and a radio transmitter. The circuit receives a signal from the key, processes it, and re-transmits it to the radio.

The Rock-Mite CW Kit
- The Rock-Mite is a 40m CW kit offered by Small Wonder Labs . It features built-in keyer, direct conversion receiver with a crystal RF bandpass filter, 500 milliwatts of power, and switchable frequency offsets to work around QRM